/*
 * Copyright (c) 2018-2020 "Graph Foundation,"
 * Graph Foundation, Inc. [https://graphfoundation.org]
 *
 * This file is part of ONgDB.
 *
 * ONgDB is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/*
 * Copyright (c) 2002-2020 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.test.matchers;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;

public class NestedThrowableMatcher extends TypeSafeMatcher<Throwable>
{
    private final Class<? extends Throwable> expectedType;

    public NestedThrowableMatcher( Class<? extends Throwable> expectedType )
    {
        this.expectedType = expectedType;
    }

    @Override
    public void describeTo( Description description )
    {
        description.appendText( "expect " )
                .appendValue( expectedType )
                .appendText( " to be exception cause." );
    }

    @Override
    protected boolean matchesSafely( Throwable item )
    {
        Throwable currentThrowable = item;
        do
        {
            if ( expectedType.isInstance( currentThrowable ) )
            {
                return true;
            }
            currentThrowable = currentThrowable.getCause();
        }
        while ( currentThrowable != null );
        return false;
    }
}
